Covering for boilers



( No Model.)

T; M'ERRIAM. Covering f0r Boilers.

Patented Aug. 31,1880.

IVitncssas:

MPETERS, PHOTO-UTNOGRAPHER, WASHINGTQN. D. C.

' UNITED STATES PATENT OFFICE.

TRUMAN MERRIAM, OF MILWAUKEE, WISCONSIN.

COVERING FOR BOILERS.

SPECIFICATION formingpart of Letters Patent No. 231,832, dated August31, .1880.

' Application filed June 28,1880. (No model.)

To all whom it may concern:

Be it known that I, TRUMAN IVIERRIAM, of Milwaukee, in the county ofMilwaukee, and

in the State of Wisconsin, have invented certain new and usefulImprovements in Coverings for Pipes, Boilers, &c. and I do herebydeclare that the following is a full, clear, and exact descriptionthereof.

My invention relates to coverings for steam pipes and boilers, and is animprovement on the covering patented to me November 10, 1874.

In the drawings, Figure 1 is a top view; Fig. 2, a transverse section ofa portion of the covering ready to be put on the pipe and Fig. 3 atransverse section of it as if in place on the pipe and finished.

I make my covering in sections by first wrapping a piece of asbcstuspaper or board, A, abouta former, through which I pass a current ofsteam or hot air. I now cover its exposed surface with cement, andleaving flanges a a, Icover the cemented surface of the asbestus with alayer of hair felt or mineraLwool, B, of uniform thickness on all sides,

and about this felt or paper I wrap a layer of heavy paperfO, cementedon its inside, the paper and asbestus clasping the felt or mineralwoollbetween them, and as the felt or mineral wool is made to adhere tothe paper and asbestos by the cement, there will be no danger of itsfalling down in upright pipes to pack in the lower parts and leave theupper parts empty. Aboutthe paper I cement a layer of heavy cloth, D,covered with cement from a point directly opposite the flanges a, aboutthree-fourths of the circumference of the covering, leaving flaps d d. Ithen place an outside former over the whole and allow it to remain untilthe section is dried, after which I take it off in perfect shape and incondition to be applied to the pipe by any intelligent workman, asfollows: Draw the flanges a a sufficiently wide apart to admit the pipebetween them, and slip the section onto the pipe. The elasticity of thecovering will then cause the edges'to close together again. Press downthe flap d, and cement it over the joint, and then (6' over that, whenthat section will be finished. The next section is put on in a likemanner and the joint made air-tight by cement and cloth, and so on.

In covering for small pipe the asbestus, felt, or mineral wool should becut clear through to the paper, and in very large pipes or boilers theasbestus, felt, or mineral wool and paper should be made in distinctlongitudinal sections and united on the pipe or boiler by the cementedcloth.

about the boiler spirally to support the covering out from it.

Paste of any kind may be substituted for the cement in my coveringwithout departing from the spirit of my invention, and instead of feltor mineral wool alone I may use both together, and instead of cementingit on only one side, I can cement the asbestos on both sides What Iclaim as my invention is 1. A covering for steam pipes, boilers, 850.,consisting of an inner layer of asbestus paper or board and an outerlayer of paper, both covered on their adjacent surfaces with ccment andclasping between them hair felt or mineral wool, in combination with anouter covering of cloth cemented to the paper and having overlappingflaps, as described, the whole shaped upon a former and dried, as setforth.

2. The covering for steam pipes, boilers, 850., consisting of the innerlayer of asbestus having flanges a, a, in combination with the outerlayer of paper, both cemented, as described, an intermediate layer offelt or mineral wool held in place by the cement on the paper andasbestos, and the outer covering of cloth having flaps d d, the wholeshaped and dried upon a former, through which is passed a current of hotair or steam, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this17th day of April, 1880.

TRUMAN MERRIAM.

Witnesses S. S. STOUT,

Gus LIPMAN.

